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Letters .Patent No. 90,180, dated .Ma/y 18, 1869,

AUTOMATIC VENTILATOR.

-bw*-n- The vBcalnecule referred to in these Letters Patent and making part of the name.

To all whom it may concern:

Be it known that I, MELVILLE E. MEAD, of Darien Depot, Fairfield county, Connecticut, have invented a new and improved Automatic Ventilator; and I do hereby declare that the following is a full, clear, and exact description thereof, which will enable others skilled in the art to make and use the same, reference being had tothe accompanying drawings, forming part of the specification.

had to the accompanying drawing, forming part of this specification, in which- Figure 1 represents a cross-section through the line Figure 2 represents a side elevation of the same.

Similar letters of reference indicate corresponding parts.

In this case the slats A are pivoted to the frame B in such a manner that their overhang will serve to eoun7 ter-balance the weight ofthe rods O yand- D, which are secured to and connect the said slats with each other. These rods O and D are hngedrespectively to the upright rods E and F, which are hinged in the usual manner to the slats A, the said rods being constructed with eyes G G on their inner ends, through which they pass and support themselves, as shown in the accompanying drawing. The amount of ventilation required is thus regulated by moving these rods C and D backward and forward, and they are held in such position by clamping the same with the thumb-screws H H.

I claim as new, and desire to secure by Letters Patent- The automatic ventilator, consistingvof the two oppositely-arranged series of pivoted slats connected by adjustable rods or bars, whereby they are adapted to operate substantially in the manner herein set forth, for the purpose specified. h

The above specification of my invention signed by me, this 9th day of February, 1869.

. MELVILLE E. MEAD.

Witnesses:

FRANK BLoeKIJEY, E. GREENE Comms. 

